Benzoazabicyclo[4.3.1] derivatives by intramolecular Michael addition of piperidinone enolates to enoates
作者:Gedu Satyanarayana、Sven Müller、Martin E. Maier
DOI:10.1016/j.tetlet.2008.03.067
日期:2008.5
Piperidinones with a 2-bromobenzyl substituent in the 5-position were subjected to a Heck coupling reaction with ethyl acrylate resulting in the highly functionalized cinnamates 9a-d. A subsequent deprotonation of the piperidinones using NaN(SiM(3))(2) in THF induced an intramolecular Michael addition of the enolate to the cinnamate part. In this way, a range of novel 2,6-methano-4H-4-benzazonines 10-13 were obtained. In each case, a separable mixture of endo/exo-diastereomers was obtained. (c) 2008 Elsevier Ltd. All rights reserved.